[EXT] Re: [PATCH 2/2] drm/panel: Add support for Raydium RM67191 panel driver

[Robert Chiras]

On Vi, 2019-06-14 at 10:39 -0300, Fabio Estevam wrote:
> Caution: EXT Email
> 
> On Fri, Jun 14, 2019 at 10:29 AM Robert Chiras <robert.chiras at nxp.com
> > wrote:
> 
> > 
> > The GPIO is active high, and the above sequence was received from
> > the
> > panel vendor in the following form:
> >         SET_RESET_PIN(1);
> >         MDELAY(10);
> >         SET_RESET_PIN(0);
> >         MDELAY(5);
> >         SET_RESET_PIN(1);
> >         MDELAY(20);
> > I got rid of the first transition to high since seemed redundant.
> > Also, according to the manual reference, the RSTB pin needs to be
> > active high while operating the display.
> That's exactly my point :-)
> 
> In normal operation the GPIO reset needs to be high.
> 
> During reset the GPIO reset needs to be low., which means that the
> GPIO reset is "active low".
> 
> So you should invert both the dts and the driver to behave correctly.
Now I get it. Thanks! I will update the dts and driver for the gpio.